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authorMichael Haggerty <mhagger@alum.mit.edu>2017-09-25 10:00:10 +0200
committerJunio C Hamano <gitster@pobox.com>2017-09-25 18:02:45 +0900
commit5b633610ec7a6c10f55e4758b047892652da8e05 (patch)
tree0495d01358133283638a588e09f1fcff5300b38a /config.mak.uname
parent14b3c344ead04deb7ff9680cd8cf927f9f9ac12a (diff)
downloadgit-5b633610ec7a6c10f55e4758b047892652da8e05.tar.gz
packed_ref_cache: keep the `packed-refs` file mmapped if possible
Keep a copy of the `packed-refs` file contents in memory for as long as a `packed_ref_cache` object is in use: * If the system allows it, keep the `packed-refs` file mmapped. * If not (either because the system doesn't support `mmap()` at all, or because a file that is currently mmapped cannot be replaced via `rename()`), then make a copy of the file's contents in heap-allocated space, and keep that around instead. We base the choice of behavior on a new build-time switch, `MMAP_PREVENTS_DELETE`. By default, this switch is set for Windows variants. After this commit, `MMAP_NONE` and `MMAP_TEMPORARY` are still handled identically. But the next commit will introduce a difference. This whole change is still pointless, because we only read the `packed-refs` file contents immediately after instantiating the `packed_ref_cache`. But that will soon change. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'config.mak.uname')
-rw-r--r--config.mak.uname3
1 files changed, 3 insertions, 0 deletions
diff --git a/config.mak.uname b/config.mak.uname
index 6604b130f8..685a80d138 100644
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -184,6 +184,7 @@ ifeq ($(uname_O),Cygwin)
UNRELIABLE_FSTAT = UnfortunatelyYes
SPARSE_FLAGS = -isystem /usr/include/w32api -Wno-one-bit-signed-bitfield
OBJECT_CREATION_USES_RENAMES = UnfortunatelyNeedsTo
+ MMAP_PREVENTS_DELETE = UnfortunatelyYes
COMPAT_OBJS += compat/cygwin.o
FREAD_READS_DIRECTORIES = UnfortunatelyYes
endif
@@ -353,6 +354,7 @@ ifeq ($(uname_S),Windows)
NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
NO_NSEC = YesPlease
USE_WIN32_MMAP = YesPlease
+ MMAP_PREVENTS_DELETE = UnfortunatelyYes
# USE_NED_ALLOCATOR = YesPlease
UNRELIABLE_FSTAT = UnfortunatelyYes
OBJECT_CREATION_USES_RENAMES = UnfortunatelyNeedsTo
@@ -501,6 +503,7 @@ ifneq (,$(findstring MINGW,$(uname_S)))
NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
NO_NSEC = YesPlease
USE_WIN32_MMAP = YesPlease
+ MMAP_PREVENTS_DELETE = UnfortunatelyYes
USE_NED_ALLOCATOR = YesPlease
UNRELIABLE_FSTAT = UnfortunatelyYes
OBJECT_CREATION_USES_RENAMES = UnfortunatelyNeedsTo